暴露于球形空气爆炸的结构化夹芯板的数值研究

IF 3.5 3区 材料科学 Q1 ENGINEERING, MECHANICAL
Solomon Abebe Derseh, Tesfaye Alemu Mohammed, Girum Urgessa
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引用次数: 0

摘要

需要开发创新的防护罩结构,以承受冲击和爆炸等极端负荷。通过塑性变形吸收大量动能作为应变能的夹层结构可提供卓越的保护。本研究利用有限元建模对承受空气冲击载荷的结构夹层防护结构进行了数值分析。首先,利用文献中的实验结果来验证和确认在 Abaqus/Explicit 软件中建模的建筑夹层结构的有限元模型。其次,对夹层结构进行了参数研究,增加了多层插入板和新提出的核心拓扑结构,以实现对气爆荷载的可行防护。有限元分析结果表明,在相同的冲击载荷下,控制夹层板表现出更高的动能,需要相应更大的内能。相反,带有附加内芯插入板的夹层结构则能更有效地消散所施加的动能,这是由于所建议的内芯配置具有非弹性塑性变形。此外,密集分层内芯结构还显著提高了能量吸收能力和背板位移时程。此外,参数研究分析表明,增加插入板的数量,并将蜂窝壁的核心拓扑结构设计为冗余、密集分层和抗屈曲支撑结构,可显著减少核心坍塌机制,如折叠、屈曲和挤压。不过,尽管有这些优点,但对面积比能量吸收指数的影响却是相反的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Numerical study on structured sandwich panels exposed to spherical air explosions
There is a need to develop innovative protective shield structures to withstand extreme loads, such as impact and blast loading. Sandwich structures that absorb significant kinetic energy as strain energy through plastic deformation offer superior protection. This study conducts a numerical analysis of structured sandwich protective structures subjected to airblast loads using finite element modeling. First, an experimental result from the literature was used to validate and verify finite element models of an architected sandwich structure modeled in Abaqus/Explicit software. Second, parametric studies were conducted on sandwich structures with additional layers of insert plates and newly proposed core topologies for viable shield protection against airblast loading. The finite element analysis results indicated that, under the same impulsive load, the control sandwich panel exhibited higher kinetic energy, demanding a proportionally larger internal energy. Conversely, sandwich structures with additional inner core insert plates dissipated the imposed kinetic energy more efficiently, due to the inelastic plastic deformation of the proposed core configurations. Moreover, the energy absorption capacity and back sheet displacement time-history were significantly improved by dense-hierarchical inner core configurations. Additionally, the parametric study analysis showed that increasing the number of insert plates and designing the core topology of cellular walls to be redundant, dense-hierarchical, and braced against buckling significantly reduced core collapse mechanisms such as folding, buckling, and crushing. However, despite these benefits, a reversed effect on the areal specific energy absorption index was observed.
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来源期刊
Journal of Sandwich Structures & Materials
Journal of Sandwich Structures & Materials 工程技术-材料科学:表征与测试
CiteScore
9.60
自引率
2.60%
发文量
49
审稿时长
7 months
期刊介绍: The Journal of Sandwich Structures and Materials is an international peer reviewed journal that provides a means of communication to fellow engineers and scientists by providing an archival record of developments in the science, technology, and professional practices of sandwich construction throughout the world. This journal is a member of the Committee on Publication Ethics (COPE).
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